To provide a quantitative delivery liquid pump for discharging a great capacity of medical solution with high quantitative accuracy for a long period.
Non-compressive liquid is filled in an inside chamber of a delivery liquid bellows 25 which changes the capacity of a pump chamber 28 storing transfer liquid or in both a chamber on the outer periphery side of a tube 61 constituting the pump chamber 28 and a syringe chamber 17 of a syringe body 13. In the syringe chamber 17, there are provided a piston rod 10 to be movable in the axial direction and a lower bellows 30 which encircles the outer periphery of the piston rod 10 extending downward from the outside of the syringe chamber 17 and a side bellows 36 which is arranged on the side of the piston rod 10. The non-compressive liquid is filled in a closed space ranging from the inside chamber of the lower bellows 30 into the inside chamber of the side bellows 36. Thus, as the lower bellows 30 expands with the reciprocation of the piston rod 10, the side bellows 36 expands in linkage therewith to keep the capacity of the closed space almost constant in which the non-compressive liquid is filled.
| JPH11159464A | 1999-06-15 | |||
| JPS5841278A | 1983-03-10 | |||
| JP2004119948A | 2004-04-15 | |||
| JPH11309405A | 1999-11-09 | |||
| JPH11230048A | 1999-08-24 | |||
| JP2000234589A | 2000-08-29 | |||
| JPS25403B1 | ||||
| JP2004339948A | 2004-12-02 |
Koji Makimura
Chihata Takahata
Toru Suzuki